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Check Link Hook

This example demonstrates how to process outgoing NHRP traffic in a scenario using one Tunnel with GRE encapsulation.

../../../../../_images/topology19.svg

Test Marks In NHRP Traffic

Description

In this scenario, a traffic policy was configured to log outgoing NHRP traffic, which is non-IP Layer 3 protocol. The special hook link-out can be used to process these outgoing frames.

Scenario

Step 1: Set the following configuration in DUT0 :

set interfaces ethernet eth0 address 192.168.100.10/24
set interfaces tunnel tun0 address 10.0.0.1/32
set interfaces tunnel tun0 encapsulation gre
set interfaces tunnel tun0 local-address 192.168.100.10
set interfaces tunnel tun0 nhrp
set interfaces tunnel tun0 traffic policy link-in LOG_NHRP
set interfaces tunnel tun0 traffic policy link-out LOG_NHRP
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
set traffic policy LOG_NHRP rule 1 log prefix NHRP__
set traffic policy LOG_NHRP rule 1 selector NHRP_SEL
set traffic selector NHRP_SEL rule 1 ether-type 8193

Note

NHRP packets use ethertype 8193 (0x2001).

Step 2: Set the following configuration in DUT1 :

set interfaces ethernet eth0 address 192.168.100.20/24
set interfaces tunnel tun0 address 10.0.0.2/32
set interfaces tunnel tun0 encapsulation gre
set interfaces tunnel tun0 local-address 192.168.100.20
set interfaces tunnel tun0 nhrp holdtime 5
set interfaces tunnel tun0 nhrp nhs 10.0.0.1 nbma 192.168.100.10
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 3: Run command protocols ip show nhrp at DUT0 and check if output matches the following regular expressions:

tun0\s+dynamic\s+10\.0\.0\.2
Show output
Iface      Type     Protocol         NBMA             Claimed NBMA     Expires(s)   Flags  Identity
tun0       local    10.0.0.1         192.168.100.10   192.168.100.10   -                   -
tun0       dynamic  10.0.0.2         192.168.100.20   192.168.100.20   5            UT

Step 4: Run command system journal show | cat at DUT0 and check if output matches the following regular expressions:

\[NHRP__-1\] ACCEPT IN=tun0 OUT=\w+
\[NHRP__-1\] ACCEPT IN= OUT=tun0
Show output
Mar 20 10:07:55.316542 osdx systemd-journald[2054]: Runtime Journal (/run/log/journal/ba147585e3944580985006d3d45a280a) is 2.4M, max 17.2M, 14.8M free.
Mar 20 10:07:55.317026 osdx systemd-journald[2054]: Received client request to rotate journal, rotating.
Mar 20 10:07:55.317056 osdx systemd-journald[2054]: Vacuuming done, freed 0B of archived journals from /run/log/journal/ba147585e3944580985006d3d45a280a.
Mar 20 10:07:55.329840 osdx OSDxCLI[143587]: User 'admin' executed a new command: 'system journal clear'.
Mar 20 10:07:55.542880 osdx OSDxCLI[143587]: User 'admin' executed a new command: 'system coredump delete all'.
Mar 20 10:07:55.881739 osdx OSDxCLI[143587]: User 'admin' entered the configuration menu.
Mar 20 10:07:55.964658 osdx OSDxCLI[143587]: User 'admin' added a new cfg line: 'set interfaces ethernet eth0 address 192.168.100.10/24'.
Mar 20 10:07:56.053605 osdx OSDxCLI[143587]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 traffic policy link-out LOG_NHRP'.
Mar 20 10:07:56.144491 osdx OSDxCLI[143587]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 traffic policy link-in LOG_NHRP'.
Mar 20 10:07:56.213920 osdx OSDxCLI[143587]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 address 10.0.0.1/32'.
Mar 20 10:07:56.307644 osdx OSDxCLI[143587]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 encapsulation gre'.
Mar 20 10:07:56.371929 osdx OSDxCLI[143587]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 local-address 192.168.100.10'.
Mar 20 10:07:56.469354 osdx OSDxCLI[143587]: User 'admin' added a new cfg line: 'set interfaces tunnel tun0 nhrp'.
Mar 20 10:07:56.536505 osdx OSDxCLI[143587]: User 'admin' added a new cfg line: 'set traffic policy LOG_NHRP rule 1 log prefix NHRP__'.
Mar 20 10:07:56.646157 osdx OSDxCLI[143587]: User 'admin' added a new cfg line: 'set traffic policy LOG_NHRP rule 1 selector NHRP_SEL'.
Mar 20 10:07:56.708986 osdx OSDxCLI[143587]: User 'admin' added a new cfg line: 'set traffic selector NHRP_SEL rule 1 ether-type 8193'.
Mar 20 10:07:56.817924 osdx OSDxCLI[143587]: User 'admin' added a new cfg line: 'show working'.
Mar 20 10:07:56.888888 osdx ubnt-cfgd[171138]: inactive
Mar 20 10:07:56.965079 osdx systemd[1]: Reloading frr.service - FRRouting...
Mar 20 10:07:56.981051 osdx watchfrr[171013]: [NG1AJ-FP2TQ] Terminating on signal
Mar 20 10:07:57.082128 osdx frrinit.sh[171168]: Stopped watchfrr.
Mar 20 10:07:57.083082 osdx frrinit.sh[171168]: Starting watchfrr with command: '  /usr/lib/frr/watchfrr  -d  --min-restart-interval 1 --max-restart-interval 600 --timeout 600 --restart-timeout 600 zebra mgmtd nhrpd staticd'.
Mar 20 10:07:57.089399 osdx watchfrr[171186]: [T83RR-8SM5G] watchfrr 10.4.1 starting: vty@0
Mar 20 10:07:57.089443 osdx watchfrr[171186]: [QDG3Y-BY5TN] zebra state -> up : connect succeeded
Mar 20 10:07:57.089467 osdx watchfrr[171186]: [QDG3Y-BY5TN] mgmtd state -> up : connect succeeded
Mar 20 10:07:57.089497 osdx watchfrr[171186]: [ZCJ3S-SPH5S] nhrpd state -> down : initial connection attempt failed
Mar 20 10:07:57.089500 osdx watchfrr[171186]: [QDG3Y-BY5TN] staticd state -> up : connect succeeded
Mar 20 10:07:57.089875 osdx watchfrr[171186]: [YFT0P-5Q5YX] Forked background command [pid 171187]: /usr/lib/frr/watchfrr.sh restart nhrpd
Mar 20 10:07:57.093798 osdx frrinit.sh[171187]: Cannot stop nhrpd: pid file not found
Mar 20 10:07:57.094668 osdx watchfrr.sh[171192]: Cannot stop nhrpd: pid file not found
Mar 20 10:07:57.108635 osdx zebra[1773]: [V98V0-MTWPF] client 36 says hello and bids fair to announce only nhrp routes vrf=0
Mar 20 10:07:57.117811 osdx watchfrr[171186]: [QDG3Y-BY5TN] nhrpd state -> up : connect succeeded
Mar 20 10:07:57.117820 osdx watchfrr[171186]: [KWE5Q-QNGFC] all daemons up, doing startup-complete notify
Mar 20 10:07:57.118380 osdx frrinit.sh[171197]: sh: line 1: ipsec: command not found
Mar 20 10:07:57.118560 osdx frrinit.sh[171168]: Started watchfrr.
Mar 20 10:07:57.219331 osdx systemd[1]: Reloaded frr.service - FRRouting.
Mar 20 10:07:57.252740 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0
Mar 20 10:07:57.298828 osdx WARNING[171290]: No supported link modes on interface eth0
Mar 20 10:07:57.300104 osdx modulelauncher[171290]: osdx.utils.xos cmd error: /sbin/ethtool -A eth0 autoneg on
Mar 20 10:07:57.300115 osdx modulelauncher[171290]: Command '/sbin/ethtool -A eth0 autoneg on' returned non-zero exit status 76.
Mar 20 10:07:57.301202 osdx modulelauncher[171290]: osdx.utils.xos cmd error: /sbin/ethtool -s eth0 autoneg on advertise Asym_Pause off Pause off --
Mar 20 10:07:57.301210 osdx modulelauncher[171290]: Command '/sbin/ethtool -s eth0 autoneg on advertise Asym_Pause off Pause off --' returned non-zero exit status 75.
Mar 20 10:07:57.323459 osdx (udev-worker)[171318]: Network interface NamePolicy= disabled on kernel command line.
Mar 20 10:07:57.764402 osdx cfgd[1833]: [143587]Completed change to active configuration
Mar 20 10:07:57.778126 osdx OSDxCLI[143587]: User 'admin' committed the configuration.
Mar 20 10:07:57.797940 osdx OSDxCLI[143587]: User 'admin' left the configuration menu.
Mar 20 10:07:59.252982 osdx OSDxCLI[143587]: User 'admin' executed a new command: 'protocols ip show nhrp'.
Mar 20 10:08:00.108747 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT= MAC=45:00:00:74:c3:c0:40:00:40:2f:2d:2b:c0:a8:64:14:c0:a8:64:0a:00:00:20:01
Mar 20 10:08:00.108827 osdx kernel: [NHRP__-1] ACCEPT IN= OUT=tun0 MAC=45:01:00:00:00:00:40:00:40:2f:00:00:c0:a8:64:0a:c0:a8:64:14:00:00:20:01
Mar 20 10:08:00.108837 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT=eth0 MAC=00:01:08:00:00:00:00:00:00:40:00:70:2b:43:00:34:01:04:04:00:04:04:00:02
Mar 20 10:08:01.107216 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT= MAC=45:00:00:74:c4:04:40:00:40:2f:2c:e7:c0:a8:64:14:c0:a8:64:0a:00:00:20:01
Mar 20 10:08:01.107323 osdx kernel: [NHRP__-1] ACCEPT IN= OUT=tun0 MAC=45:01:00:00:00:00:40:00:40:2f:00:00:c0:a8:64:0a:c0:a8:64:14:00:00:20:01
Mar 20 10:08:01.107335 osdx kernel: [NHRP__-1] ACCEPT IN=tun0 OUT=eth0 MAC=00:01:08:00:00:00:00:00:00:40:00:70:2b:42:00:34:01:04:04:00:04:04:00:02
Mar 20 10:08:01.324380 osdx OSDxCLI[143587]: User 'admin' executed a new command: 'protocols ip show nhrp'.

Step 5: Run command traffic policy show at DUT0 and check if output matches the following regular expressions:

1\s+NHRP_SEL\s+\b[^0]\d*
Show output
Policy LOG_NHRP -- ifc tun0 -- hook link-in prio very-high

---------------------------------------------------------------
rule   selector  pkts match  pkts eval  bytes match  bytes eval
---------------------------------------------------------------
1      NHRP_SEL           4          4          456         456
---------------------------------------------------------------
Total                     4          4          456         456

Policy LOG_NHRP -- ifc tun0 -- hook link-out prio very-high

---------------------------------------------------------------
rule   selector  pkts match  pkts eval  bytes match  bytes eval
---------------------------------------------------------------
1      NHRP_SEL           2          2          272         272
---------------------------------------------------------------
Total                     2          2          272         272
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